I also went with the 412's but the standard, I'm at a little over 200 and I felt the difference right away over stock. As for as the front springs I just cut the pvc spacer so everything compressed to the stock length and I have had no regrets at all. Also as Yota said play with different preload settings it can make a big difference in the ride. Good luck and ride safe!

05 TBA Mulberry/Silver, Thunder Bike pipes, K&N single Filter, 132 main Jet's, Snorkles Removed